LAN9220 datasheet(85/142 Pages) MICROCHIP

Part #	LAN9220

Description	16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

PDF	142 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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85 / 142 page

 2006-2017 Microchip Technology Inc.

DS00002417A-page 85

LAN9220

5.3.18

FREE_RUN—FREE-RUN 25MHZ COUNTER

This register reflects the value of the free-running 25MHz counter.

5.3.19

RX_DROP– RECEIVER DROPPED FRAMES COUNTER

This register indicates the number of receive frames that have been dropped.

Offset:

9Ch

Size:

32 bits

Bits

Description

Type

Default

31:0

Free Running SCLK Counter (FR_CNT):

Note:

This field reflects the value of a free-running 32-bit counter. At

reset the counter starts at zero and is incremented for every

25MHz cycle. When the maximum count has been reached the

counter will rollover. Since the bus interface is 16-bits wide, and

this is a 32-bit counter, the count value is latched on the first read.

The FREE_RUN counter can take up to 160nS to clear after a

reset event.

Note:

This counter will run regardless of the power management states

D0, D1 or D2.

Offset:

A0h

Size:

32 bits

Bits

Description

Type

Default

31-0

RX Dropped Frame Counter (RX_DFC). This counter is incremented every

time a receive frame is dropped. RX_DFC is cleared on any read of this

An interrupt can be issued when this counter passes through its halfway

point (7FFFFFFFh to 80000000h).

00000000h

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